Sheet-metal window-sash.



I v PATEVNTED MAR. 20,1906. J. W. WATKINS. SHEET MBTAL'WINDOW SA-SH.

APPLICATION IiLED JUNE 14, 1904.

all ichom it. may concern? certaiin i-new have nvented tch; merciless isaspecifiea ti on, refheinmhod to eaccompanying drawown,mymventionresepplied to a sh: composed wholly of sheet metal ed with--nfde1;eut-grooves in: the jtcntion; of thepene. vent on relate tottl-ie"method of '11 mg,

tion; of the ,rnnntin. ventronco nprehends such construction of thegrooves and the ed o ni'n fzteings of the muntin endreils 'th-rtt undert 1e-influ-' v ence of heat thegpnne subjected to on in zocreasedpressure or grip between the outer edges of the grooves, so that thegreater the heat to which it is sub ected the more tightly "the one isheld in place.

y' invention further comprehends a convenient method of uni ting the munti n ,whether horizontal or vertical, to the rails of the sash in such'eway topreventthe members from springing apart under influence ofheet.

' 1111 the accompanying drawings, Figure'I is 3o sn elevation of asheetinetal sesh embody- 11D". my improvements. Fig. II-ise horizontelsectional viewof the fi ht-handside rail, tztkcn on the line H II in i iFig. III is :t'gyerticel sectional-view. i the miintin 'taken onthefiine III-I11 in F ig. I.

g n said figuresf]. 1- are theside reils, 2 is the hottomrai 315111)meeting-rail, and 4 4 are {the rnnntms.

sheetmetel, only such. details of construction b n invention. 1 7 Theside rails 1 are each formed of two ieces of sheet metal 5 and 6.Asshowi-i in i i g. H, the piece 5 constitutes the. plane sides,

"'ourved fecin side rail, whii e the other piece 6, which is i! terfoided at its edges with the edges of-sni piece 5, completes the back ofthelreil. An "5 -engulzn'r. recess 7 may hei'ormed at one of the B"ihknown-th'itt'LJomi"W.WATKrNs, of 'formed the'gro'ove 9 for the Qlphie,in thefiStete of Pennsylvania; and. useful 1111-1sinSheetMettzlWindow-Sashes, "of'thegroo'veis such thatit's outero V 6 xing edges receive th'e'pene l'q snugly I f them, the'only space leftinthe oovefefter the pene'of glass is inserted being seid gripping edgesend -divergingftl refrom end-uh ing the-,sheetmetel1pieces of saidnn'mtinsare respective "fecing walls horizontal i All of said sashmembers are formed by folding and interlocking pieces or eing shown asare pertinent to my present;

and part of the back of the;

on rmzm nnnrnm, PENNS L N AQ .jstifier mlfliehi ttimioowsess-n t Y} L ISpeeificetion of LettersPatntQ Petentedlliiercn 20,1906, 7 v f eemerisJe sie-mot. fleIiaIQ fBl B QE Q and between these, cri'rves is Ipane of glass 10. Said groove 9co'mprises a flirt bottom-wall 11 curves8 8 end undercut side walls 12 1 2." Thewidth to the bottom ofthegroove.

The m'untinsd of thefsash streiforine d oftwo-pieces lliand15,"ofsheetmetal, bent es hest'shownini ig; III The e posite sides{i formed of said pieces'l i and a15nn'd each comprises a planc'well 16,merging into two ogee-curved l8 and two overhanging j side walls 19,forming-the opposite grooves '20, having theirbottom wellsformed by thecentro lly interloeked flanges 21 end 22 in the re- 7 5 s eetive pieces14, and 15, tllB' OXtT-Gll'lltlGS of t 10 former being bent out so as toclenclr the' latter. As shown in .Fi II, the muntin-4 is engaged withthe mi extend in the groove 9 of thereil 1 through slots .25 cut in thebottom wall of said groove and are clenched within the rail], as shown.

When the p'e'nes 10 are inserted I in their grooves, e su table cement26 is run n liquid form into the base of the grooves and allowed toharden within the spaces incloscd by the gripping edges of the grooves.

For this purpose I prefer to use a fireproof cement com- 9o prism rsodium. silicate. Such cement may nclur e other fire-resis tingingredients, such as asbestos. I

U po n the occurrence oie fire in the room fitted with a sashconstructed in accordance with in invent on the heat does not directlyefi'eet t ecement by which the glass is held in place, beceuseof thefeet that the edges of the grooves pressftightlyhgninst the surfaceof'the glass; Consequently thecement is not as ensi y melted as ifthespnces for it were ex-, ces oi the prior art. When s'ub ected tointense heat, the curved facing wells 8 and 18 tend to straightenthemselves out, as do ellcurved pieces of sheet metal 1in- 1o dersimilar circun'istmiees, and the straighten ing oi" these wallsunderpthe influence of heat occasions pressure between the edges of rthe grooves, thus tightening the grip of the posed es in devi edges ofsaid grooves upon the glass, 'so that 1 1o 1 1 by projectinr flaps 24,80- which being formed at the end of t e muntin tin comprising two bentand interlockedpieces of sheet metal, one piece of sheet metal formingall of the Inuntin upon one side of the pane-grooves and another pieceforming all of the Inuntin on the other side of the panegrooves, and thetwo being interlocked by the clenching of'the portions which projectbetween the panes, to form the bottoms of the grooves,substantially asset forth.

2. In a sheet-metal window-sash a memcut straight sides andogee-curvedsurfaces outwardly adjacent to said straight sides of thegroove, whereb upon the straightening of said surfaces un er theinfluence of heat, oove upon the the grip of the edges of the pane isincreased, substantia 1y as set forth.

sumac 3; In a-sheetmetalnvindow-sash a muntin' having pane-groovescomprising flat bottoms and undercut straight sides spaced to snugly"embrace a pane'of glass; an 0 ee-curved surface upon the muntin outwar1y adjacent to the sides of thezgrooves whereby u on the straighteningof said surface under t e influence of heat the grip of the edges of thegroove upon the pane is increased, substantially as set forth.

4. In a sheet-metal-window sash, the combination of a muntin provided atthe railabutting) end with vertical projecting flaps is formed yextension of the side walls oft grooves of the muntin; and arailprovided ;with vertical companion slots at both interior corners ofthe pane-groove forthe receptio'n of the flaps projecting from themuntin; whereby the inuntin ma .rail by the clenching of t eflaps-within the v rail, substantially as set forth.-

ber comprising a pane-groove having underbe united tothe In testimonywhereof I have hereunto signed my name, at Philadelphia, Pennsyl- Vania,this 13th day of June, 1904.

JOHN W-WATKINS.'

Witnesses:

J AMES H. BELL, E; L. FULLERTON.

